Transcript The Cell and its Inheritance

The Cell and its Inheritance
Mrs. Wharton’s Science Class
Walter Sutton
• Obseved sex cells have HALF the number
of chromosomes as body cells
• Offspring had the exact number of
chromosomes in its body cells as its
parents
• Chromosomes in body cells actually
occurred in pairs, one chromosome in
each pair coming from the male and one
from the female
His Conclusions
• Genes are located on chromosomes
• Chromosome Theory of Inheritancegenes are carried from parents to offspring
on chromosomes
Meiosis
• How organisms produce sex cells
• Meiosis- process by which the number of
chromosomes are reduced by half to form
sex cells- sperm and eggs.
• During meiosis the chromosome pairs
separate and are distributed to two
different cells.The resulting sex cells only
have half as many chromosomes as the
other cells in the organism.
Result
• When they combine each sex cell
contributes half the number of
chromosomes to producce offspring with
the correct number of chromosomes.
• Punnett squares show the result of
meiosis..
Chromosomes
• Chromosomes are made up of many
genes joined together like beads on a
string.
• Each gene controls a particular trait.